Tradition had it that when the tails of terriers were docked, a guestemate was made as to the eventual length and it should fill the hand of a man. Why it was thought that a docked tail would make life easier for the person dragging out the dog, I haven't a clue because clearly it wouldn't. Having dragged out a terrier or two, the best way I've always found is to grab a back leg or two!
Terriers with full length tails do look a bit odd, I think, but then docking them is no more than fad or fashion and serves no real or practical purpose, or none that I can see. There yer go, a foot in both camps!
My jrt is the only undocked terrier we have. He does a lot of bushing and his tail gets shredded and bleeds badly. So I wish he had of been. The other 2 docked ones don't get that issue. Terriers don't just go to ground 😆